Battery grip

[KieranSLR]

purchased this for my d3200 as i know all d3100 grips fit
http://www.amazon.co.uk/gp/aw/d/B0074L1CB4?qid=1355841300&sr=8-4

recived it today and the camera wont tun on with the grip
im unsure if it needs 2 batteries in but the camera is not very old at all
any ideas,

thanks